55616778890 has 16 divisors (see below), whose sum is σ = 100124737632. Its totient is φ = 22243481424.

The previous prime is 55616778851. The next prime is 55616778901. The reversal of 55616778890 is 9887761655.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 330824 + ... + 469763.

It is an arithmetic number, because the mean of its divisors is an integer number (6257796102).

Almost surely, 2^55616778890 is an apocalyptic number.

55616778890 is a deficient number, since it is larger than the sum of its proper divisors (44507958742).

55616778890 is a wasteful number, since it uses less digits than its factorization.

55616778890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807541.

The product of its (nonzero) digits is 25401600, while the sum is 62.

The spelling of 55616778890 in words is "fifty-five billion, six hundred sixteen million, seven hundred seventy-eight thousand, eight hundred ninety".